|Area||7.17 sq mi (19 km2)|
|- land||7.01 sq mi (18 km2)|
|- water||0.16 sq mi (0 km2)|
|Density||694.0 / sq mi (268 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Caseyville, Illinois|
Caseyville is located at (38.633176, -90.032785).
According to the 2010 census, the village has a total area of 7.17 square miles (18.6 km2), of which 7.01 square miles (18.2 km2) (or 97.77%) is land and 0.16 square miles (0.41 km2) (or 2.23%) is water.
As of the census of 2000, there were 4,310 people, 1,686 households, and 1,126 families residing in the village. The population density was 694.0 people per square mile (268.0/km²). There were 1,786 housing units at an average density of 287.6 per square mile (111.0/km²). The racial makeup of the village was 89.30% White, 7.84% African American, 0.35% Native American, 0.16% Asian, 1.04% from other races, and 1.30% from two or more races. Hispanic or Latino of any race were 3.53% of the population.
There were 1,686 households out of which 28.2% had children under the age of 18 living with them, 46.4% were married couples living together, 14.5% had a female householder with no husband present, and 33.2% were non-families. 25.8% of all households were made up of individuals and 12.6% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.98.
In the village the population was spread out with 23.3% under the age of 18, 8.7% from 18 to 24, 27.9% from 25 to 44, 22.2% from 45 to 64, and 17.9% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 93.4 males. For every 100 females age 18 and over, there were 89.5 males.
The median income for a household in the village was $31,512, and the median income for a family was $36,429. Males had a median income of $30,943 versus $20,713 for females. The per capita income for the village was $15,467. About 6.8% of families and 9.8% of the population were below the poverty line, including 15.4% of those under age 18 and 5.6% of those age 65 or over.
Notable people 
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
Zadok Casey, a U.S. Representative, the founder of Mount Vernon, died here. Therefore they called it Caseyville, he was then buried in Mount Vernon.